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Add experimental RS-485 support

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Many modern RS-485 serial devices such as the ones from FTDI already
operate in RS-485 mode by default and will work with tio out of the box.
However, there are some RS-232/485 devices which need to be switched
from e.g. RS-232 to RS-485 mode to operate accordingly on the physical
level.

This commit implements the switching mechanism and interface required to
enable RS-485 mode. It only works on Linux and with serial devices which
use device drivers that support the Linux RS-485 control interface.

The RS-485 feature is detailed via the following options:

 --rs-485                           Enable RS-485 mode
 --rs-485-config <config>           Set RS-485 configuration

Set the RS-485 configuration using the following key or key value pair
format in the configuration field:

 RTS_ON_SEND=value             Set logical level (0 or 1) for RTS pin when sending
 RTS_AFTER_SEND=value          Set logical level (0 or 1) for RTS pin after sending
 RTS_DELAY_BEFORE_SEND=value   Set RTS delay (ms) before sending
 RTS_DELAY_AFTER_SEND=value    Set RTS delay (ms) after sending
 RX_DURING_TX                  Receive data even while sending data

If defining more than one key or key value pair, they must be comma
separated.

Example use:

 $ tio /dev/ttyUSB0 --rs-485 --rs-r485-config=RTS_DELAY_AFTER_SEND=50,RX_DURING_TX
This commit is contained in:
Martin Lund 2022-09-10 15:20:42 +02:00
parent a58d406a3c
commit ee46686fb6
13 changed files with 351 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

19
src/options.c
View file

@ -35,6 +35,7 @@
#include "misc.h"
#include "print.h"
#include "tty.h"
#include "rs485.h"
enum opt_t
{
@ -44,6 +45,8 @@ enum opt_t
OPT_LOG_STRIP,
OPT_LINE_PULSE_DURATION,
OPT_RESPONSE_TIMEOUT,
OPT_RS485,
OPT_RS485_CONFIG,
};
/* Default options */
@ -78,6 +81,10 @@ struct option_t option =
.response_wait = false,
.response_timeout = 100,
.mute = false,
.rs485 = false,
.rs485_config_flags = 0,
.rs485_delay_rts_before_send = -1,
.rs485_delay_rts_after_send = -1,
};
void print_help(char *argv[])
@ -109,6 +116,8 @@ void print_help(char *argv[])
printf(" -x, --hexadecimal Enable hexadecimal mode\n");
printf(" -r, --response-wait Wait for line response then quit\n");
printf(" --response-timeout <ms> Response timeout (default: 100)\n");
printf(" --rs-485 Enable RS-485 mode\n");
printf(" --rs-485-config <config> Set RS-485 configuration\n");
printf(" -v, --version Display version\n");
printf(" -h, --help Display help\n");
printf("\n");
@ -295,6 +304,8 @@ void options_parse(int argc, char *argv[])
{"hexadecimal", no_argument, 0, 'x' },
{"response-wait", no_argument, 0, 'r' },
{"response-timeout", required_argument, 0, OPT_RESPONSE_TIMEOUT },
{"rs-485", no_argument, 0, OPT_RS485 },
{"rs-485-config", required_argument, 0, OPT_RS485_CONFIG },
{"version", no_argument, 0, 'v' },
{"help", no_argument, 0, 'h' },
{0, 0, 0, 0 }
@ -437,6 +448,14 @@ void options_parse(int argc, char *argv[])
option.response_timeout = string_to_long(optarg);
break;
case OPT_RS485:
option.rs485 = true;
break;
case OPT_RS485_CONFIG:
rs485_parse_config(optarg);
break;
case 'v':
printf("tio v%s\n", VERSION);
exit(EXIT_SUCCESS);